Granted Patent
Utility
US 4,490,819 · App. 06/370,608
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Inventors:
Leonard Edward Bogan, Jr., Paul H. Knapke, Robert L. Miller
Patented Case
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Granted: Dec 25, 1984
Filed: Apr 22, 1982
Inventors
Leonard Edward Bogan, Jr.
Paul H. Knapke
Robert L. Miller
Assignee (at issue)
International Telephone and Telegraph Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.